In the rich text editor:
@Serzuzn
In a comment:
[Serzuzn](https://chowlings.com/user/Serzuzn)
For Names and Avatars:
In the rich text editor:
%Serzuzn
In a comment:
[![Serzuzn's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Serzuzn) [Serzuzn](https://chowlings.com/user/Serzuzn)